package com.sxhuayuan.parking.utils;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;

/**
 * 微信小程序根据code获得用户appid
 * 
 * @author 何龙
 * @create 2019-04-15 14:08
 */
//@Component
public class WXAppletUserInfo {
	private static Logger log = LoggerFactory.getLogger(WXAppletUserInfo.class);

	// 小程序的appid
	@Value("${wechat.small_program.appId}")
	private String appId;
	// 小程序appSecret
	@Value("${wechat.small_program.appSecret}")
	private String appSecret;

	

	/**
	 * 获取微信小程序 session_key 和 openid
	 *
	 * @author zhy
	 * @param code
	 *            调用微信登陆返回的Code
	 * @return
	 */
	public JSONObject getSessionKeyOropenid(String code) {
		// 请求地址 https://api.weixin.qq.com/sns/jscode2session
		String requestUrl = "https://api.weixin.qq.com/sns/jscode2session";
		Map<String, String> requestUrlParam = new HashMap<>();

		requestUrlParam.put("appid", appId); // 开发者设置中的appId
		requestUrlParam.put("secret", appSecret); // 开发者设置中的appSecret
		requestUrlParam.put("js_code", code); // 小程序调用wx.login返回的code
		requestUrlParam.put("grant_type", "authorization_code"); // 默认参数

		// 发送post请求读取调用微信 https://api.weixin.qq.com/sns/jscode2session 接口获取openid用户唯一标识
		return JSON.parseObject(sendPost(requestUrl, requestUrlParam));
	}

	public static String sendPost(String url, Map<String, ?> paramMap) {
		PrintWriter out = null;
		BufferedReader in = null;
		StringBuilder result = new StringBuilder();

		StringBuilder param = new StringBuilder();

		for (String key : paramMap.keySet()) {
			param.append(key).append("=").append(paramMap.get(key)).append("&");
		}

		try {
			URL realUrl = new URL(url);
			// 打开和URL之间的连接
			URLConnection conn = realUrl.openConnection();
			// 设置通用的请求属性
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("connection", "Keep-Alive");
			conn.setRequestProperty("Accept-Charset", "utf-8");
			conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
			// 发送POST请求必须设置如下两行
			conn.setDoOutput(true);
			conn.setDoInput(true);
			// 获取URLConnection对象对应的输出流
			out = new PrintWriter(conn.getOutputStream());
			// 发送请求参数
			out.print(param);
			// flush输出流的缓冲
			out.flush();
			// 定义BufferedReader输入流来读取URL的响应
			in = new BufferedReader(new InputStreamReader(conn.getInputStream(), StandardCharsets.UTF_8));
			String line;
			while ((line = in.readLine()) != null) {
				result.append(line);
			}
		} catch (Exception e) {
			log.error(e.getMessage(), e);
		}
		// 使用finally块来关闭输出流、输入流
		finally {
			try {
				if (out != null) {
					out.close();
				}
				if (in != null) {
					in.close();
				}
			} catch (IOException ex) {
				ex.printStackTrace();
			}
		}
		return result.toString();
	}
}
